Screen 1 – The Swamp Demon
After Final Selection, Tanjiro, Sans, and Papyrus make their way toward their first mission.
A crow lands on Tanjiro's shoulder and gives the report:
"North town! Young girls disappearing!"
Tanjiro nods. "Let's go. Someone is in danger."
Sans floats along beside him, hands in his pockets. "Sounds messy."
Papyrus marches proudly. "Fear not! For the great Papyrus shall protect all innocent civilians!"
They enter the town at night.
A terrified mother explains how her daughter was taken by a demon that slips into the ground like mud.
Tanjiro kneels beside her. "I promise we'll bring her back."
Sans taps the ground with his foot. "Something's under us."
The earth suddenly ripples.
A pale hand shoots out of the mud.
Papyrus yells, "DEMON ALERT!"
Three demons emerge—the Swamp Demon split into clones—black, slick, and grinning.
Tanjiro draws his sword instantly.
"Sans. Papyrus. Be careful. This thing can move underground."
Sans teleports to the side. "Yeah, noticed."
Papyrus summons a wall of bones with a shout. "Bone Defense Activated!"
The first clone charges Tanjiro.
The second disappears into the ground.
The third lunges at Papyrus.
Tanjiro blocks the first demon and counters with a clean slash.
Papyrus smashes his attacker backward with a bone hammer. "Ha! You stand no chance against my heroic might!"
But the second clone reappears behind Sans, clawing upward.
Sans glances over his shoulder.
"Heh. Bad move."
His left eye glows blue.
The demon freezes in midair.
"Gravity hold," Sans mutters.
He slams the demon into the ground, leaving a crater.
Tanjiro calls out, "They're connected! Three bodies but one demon. If we defeat all three, we win!"
Papyrus nods dramatically. "Then let us triumph in synchronized fashion!"
The demons regroup and dive back into their swamp dimension.
Tanjiro readies his stance.
Papyrus lifts a bone spear.
Sans cracks his knuckles.
"We're going in," Tanjiro says.
Sans smiles. "Into the swamp we go."
The shadows swirl around them as the demon drags all three into its dark underground domain.
Screen 2 – Inside the Swamp
The world twists as the ground pulls Tanjiro, Sans, and Papyrus downward.
A cold pressure hits their bodies.
Color drains from the space around them.
They land inside the Swamp Demon's realm:
a dark purple void filled with floating dirt, broken mirrors, and the smell of rot.
Papyrus looks around, horrified. "This décor is… unacceptable!"
Sans tilts his head. "Yeah. Zero stars. Would not visit again."
Tanjiro steadies his breathing. "Stay alert. The demon moves faster down here."
Three shadows streak through the water-like air.
The clones circle them at high speed.
Tanjiro barely blocks the first claw swipe.
The second demon aims for Papyrus' spine.
The third darts at Sans, jaws wide.
Sans teleports out instantly. "Nope."
Papyrus spins his bone shield, deflecting every hit like a spinning wheel.
"MY DEFENSE IS IMPECCABLE!"
Tanjiro's eyes sharpen.
He reads the demon's movement pattern—three bodies weaving in a triangle.
"They're trying to split us up!" Tanjiro warns.
Sans taps the ground lightly. "Not happening."
He expands gravity outward, slowing all three clones for just a moment.
It's enough.
"Papyrus! Right side!" Tanjiro shouts.
Papyrus leaps, bone spear glowing white in the dim light.
He impales the right clone through the chest.
It bursts into mud.
Tanjiro rushes the second clone.
"Water Breathing… Third Form!"
He slices clean through its neck.
The body collapses.
Only one clone remains—the true body.
It screeches and fires a barrage of swamp tendrils.
Sans steps forward, eye glowing blue.
"I'll shut you up."
A massive Gaster Blaster materializes behind him.
The blast lights the entire dimension white.
But the demon dodges at the last second, moving through the swamp like liquid.
Tanjiro grits his teeth. "It's scared… good."
Papyrus points dramatically. "Corner it! Victory awaits!"
The demon tries to escape deeper into the void.
That's when Sans snaps his fingers.
The space ahead bends—
a gravity wall blocks the demon's path.
"End of the line," Sans says.
Tanjiro moves in.
"Water Breathing… Sixth Form!"
The sword cleaves straight through the demon's neck.
The swamp dimension collapses.
---
They fall back onto solid ground in the human world as the demon dissolves into dust.
Papyrus lands heroically. "Another glorious victory!"
Sans sits cross-legged like nothing happened. "Easy."
Tanjiro exhales softly.
"One more family saved."
To be continued.